Understanding VOCs in Shelby County Water and Treatment Options for Memphis Households
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VOC Reduction System Water Filter
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What a Laboratory's Method Detection Limit Means When a Compound Is 'Not Detected'
When a laboratory reports that a volatile organic compound (VOC) is 'not detected' at a certain level, it means the compound was not measured above the method detection limit (MDL) for the test. For the Memphis Light, Gas & Water system serving Shelby County, federal monitoring from 2013 to 2015 found no measurements above reporting levels ranging from 0.03 to 5.0 micrograms per liter (µg/L), equivalent to parts per billion (ppb), for all tested VOCs. This includes compounds like 1,1-dichloroethane, chloromethane, and MTBE. 'Not detected' does not mean absolute absence; rather, any presence was below the laboratory’s sensitivity threshold during that period.
How Seasonal Water-Table Changes Move a Solvent Plume Relative to a Well Screen
Volatile organics in groundwater can form solvent plumes that shift position with seasonal fluctuations in the water table. In Shelby County’s groundwater-sourced system, rising water tables may raise solvent plumes closer to well screens, potentially increasing measured concentrations at the source. Conversely, during drier seasons, plumes may migrate deeper or laterally away from well intakes. Such movement can affect the variability of VOC detections over time but does not inherently signal a health concern without exceeding federal maximum contaminant levels, which this system has not recorded.
Which Fixtures, Appliances or Processes Are Affected First and Why
Residential water uses involving aeration or heating—such as shower heads, faucets, coffee makers, and humidifiers—often release volatile organics more readily due to increased water temperature or exposure to air. If VOCs are present in tap water, these fixtures may be where homeowners first notice effects like unusual tastes or smells, despite the system’s records showing no health-based violations. Understanding which household points interact with volatile compounds helps prioritize where treatment or filtration can be most effective.
How the Documented Treatment Technology Removes or Neutralizes the Constituent
The Fleck VOCs & Industrial Chemicals Filter system offers a direct-purchase option that ships ready to configure for residential use. It employs targeted filtration technology designed to reduce multiple classes of volatile organic compounds and industrial solvents commonly appearing in groundwater. By adsorbing or chemically binding these compounds, the system minimizes their presence at household taps. This advanced treatment supports household decisions aimed at lowering VOC concentrations below detection thresholds, complementing municipal water quality safeguards documented in Shelby County’s public system record.
Which Volatile Organic Compounds Appear in This Record and Which Do Not, Named from the Facts
According to the EPA’s Unregulated Contaminant Monitoring Rule data for Memphis Light, Gas & Water’s public water system, the following VOCs were monitored but not detected above reporting levels: 1,1-dichloroethane, chloromethane, bromomethane, HCFC-22, Halon 1011, 1,3-butadiene, and MTBE. No federal maximum contaminant levels exist for these unregulated VOCs, and none were measured above detection limits in these surveys. Other volatile organics not included in this dataset either were not monitored or did not meet the criteria for reporting within this system’s record.
To understand your household’s specific water quality, individual testing is necessary because regional or system-level data cannot determine conditions in any single home.
These findings and treatment considerations reflect Shelby County’s municipal water supply record as reported by the EPA’s Safe Drinking Water Information System (SDWIS) and the Unregulated Contaminant Monitoring Rule (UCMR3) data from 2013 to 2015.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-12-08. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Memphis Light, Gas & Water (TN0000450), TN: 140 results across 7 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level